Teenagers Social conditions 67 Sexual behavior 61 Adolescence 59 Prevention 54 Youth 45 Children 44 more ... Adolescent psychology 36 Books and reading 30 History 28 Attitudes 27 Drug use 25 Adolescent 23 Conduct of life 23 Mental health 23 Education 22 Social aspects 22 Suicidal behavior 21 Health and hygiene 18 High school students 17 Drug abuse 15 Families 15 Social life and customs 15 Suicide 15 Young adults 15 Alcohol use 14 Parent and teenager 13 Substance use 13 Treatment 13 Family relationships 12 less ...